New and previous qualitative results for metals (Cr, Pd, Ta, W, Ir, Au) with enhanced concentrations of point defects localized near to internal interfaces (especially the intercrystallite-conjugation regions of nominally pure metallic polycrystals) were considered. The results were obtained by using a new method which was based upon the use of atomic probes that were capable of providing spectral information on the states that were populated by the probes, and upon the diffusional transport of atomic probes into the regions of localization of the states to be studied. In polycrystals of nominally pure metals, the enhanced concentrations of point defects were localized within the normal lattice of the metal; outside of the cores of intercrystallite-conjugation regions. Two types of solid solution in the enhanced concentrations of point defects were distinguished. These differed with respect to the relationships between the magnitudes of isomeric shifts of the Mössbauer radiation of atomic probes (localized within the enhanced concentrations of point defects or in the bulk of the lattice) and in the signs of the derivatives of the Mössbauer parameters with respect to the reciprocal temperature at various sub-stages of isochronal annealing. It was shown that, in most metals studied, the so-called natural solid solutions in the enhanced concentrations of point defects were formed from classical interstitial impurities. However, in the case of Cr, the enhanced concentrations of point defects were formed by the substitutional impurity Mn and, in Au, by the substitutional impurity Fe.

Regions of Enhanced Concentration of Point Defects Localized near to Internal Interfaces in Condensed Media - I. Types of Solid Solutions in Cr, Pd, Ta, W, Ir and Au. S.M.Klotsman, V.N.Kaigorodov, M.I.Kurkin, A.V.Ermakov, V.K.Rudenko, A.N.Timofeev, N.I.Timofeev: Physics of Metals and Metallography, 2002, 93[4], 349-57